Safety device for elevators.



A. J. BAUTZ.

SAFETY DEVIGE FOR ELEVATORS.

APPLICATION FILED MAR. 2B, 1906.

Patented June 20, 1911.

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A. J. BAUTZ. SAPETYYDEVIGE FOR ELEVATORS. APPLICATION FILED MAR. 28,190B.

Patented June 20, 1911.

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ANDREW J. BAUTZ, OF MILWAUKEE, WISCONSIN.

SAFETY DEVICE FOR ELEVATORS.

T 0 all whom it may concern:

Be it known that I, ANDREW J. BAUTZ, residing in Milwaukee, in thecounty of Milwaukee and State of Wisconsin, have invented new and usefulImprovements in Safety Devices for Elevators, of which the following isa description, reference being had to the accompanying drawings, whichare a part of this specification.

My invention has relation tov improvements in safety devices for.elevators.

The object of the invention is to provide an improved construction andcombination of parts, whereby the elevator cage is prevented fromtraveling up or down while the door leading to the elevator shaft isopen, the travel of the cage only being permitted when the door is fullyclosed.

lVith the above primary object, and other incidental objects, in view,the invention consists of the devices and parts, or the equivalentsthereof, as hereinafter more fully set forth.

In the accompanying drawings, Figure 1 is a section through an elevatorshaft or well and through the elevator cage, the door of the elevatorshaft being shown as closed; Fig. 2 is a similar section to Fig. 1, butshowing the door leading to the elevator shaft as partly open; Fig. 3 isa horizontal section through the mechanism shown in Fig. 1, taken on aplane above the mechanism for eifecting the locking of the operatinglever of the cage; Fig. 4 is a section through a fragment of theelevator shaft and the elevator cage, taken on a plane at right anglesto the plane of Figs. 1 and 2; and Fig. 5 is a section through anelevator shaft and elevator cage, showing a modified form of the lockingmechanism for the operating lever.

Referring tothe drawings, the numeral 6 indicates an elevator shaft orwell, 7 an elevator cage adapted to travel therein, 8 an opening in theelevator shaft located at a landing, and 9 a sliding door forcontrolling the opening, said door having rigidly secured thereto, andtransversely thereof, a rail 10, which rail, preferably, has its inner'end projecting laterally beyond the inner edge of the door.

Within the elevator cage is the usual operating lever 11. Attached toone of the sides of the elevator. well, and extending upwardly a desireddistance is a standard 12,

and pivoted between its ends to this stand Serial No. 423,844.

Specification of Letters Patent. Patented June 20, 1911 Applicationfiled March 28, 1908.

ard is a lever 13, said lever carrying at its upper end a roller 14.Over this roller the rail 10 is adapted to travel whenever the door isopened or closed. Pivotally connected to the lower end of the lever 13is a link 15. lVithin a pocket or formed in one of the end walls of theelevator shaft or well is a rock-shaft 17 mounted in suitable bearings18, 18, said shaft provided at opposite ends with upwardly extendingarms 19 and 20. To the arm 19 the outer end of the link 15 is pivotallyjointed. The arm 20, when the rock-shaft is turned, is adapted tooperate the mechanism for locking and unlocking the operating lever 11.

recess 16 Referring now particularly to the construction illustrated inFigs. 1 to 4 of the' drawings, the numeral 21 indicates a rod whichpasses freely through the side of the elevator cage which is parallel tothe wall of the elevator shaft in which the pocket or recess 16 islocated. The outer end of this rod passes through one end of anoutwardly bowed flat spring 22, the opposite end of said spring beingsecured to the side of the elevator cage. A nut 23 is turned on to theas a keeper for the operating lever 11. The

inner edge of the bar 24 is provided centrally with a notch 26.

In explanation of the operation of the mechanism, it is to be statedthat when the elevator cage reaches a landing, the operator slides thedoor 9 from the closed position illustrated in Fig. 1 toward the rightand to an open position (Fig. 2 representing the door as being slidtoward the right to a partly open position). As the door is thus moved,the free cammed end of rail 10 acts on the roller 14 at the upper end oflever 13, and causes said upper end of the lever to turn toward theright, thereby moving the link 15 toward the left. This movement of thelink pulls the upwardly extending arm 19 toward the left, andconsequently the rock-shaft 17 and its other arm 20 are turned in thesame direction. The arm 20 in thus moving toward the left is caused tocontact with the outer end of the rod 21. This rod, together with thenotched bar 24 at the inner end thereof, are thereby forced toward theoperating lever 11. It will be understood that the operating lever 11occupies an upright central position with relation to the guide orkeeper 25, when the elevator cage reaches a landing and is stopped. Theresult is that when the bar 24 is moved toward the operating lever 11 asjust explained, the notch 26 thereof is brought into engagement withsaid operating lever 11, and consequently the said lever is lockedagainst movement so long as the door 9 is open. The elevator cage,therefore, cannot be caused to travel upwardly or downwardly so long asthe door remains open. I/Vhen it is desired to start the elevator cage,the door is pushed by the operator toward the left or toward a closingposition. This releases the lever 13, and the spring 22 then reacts, andpulls the rod 21 and the connected notched bar 2t outwardly out oflocking engagement with the operating lever 11. The outward movement ofthe rod 21 causes a turning of the arm 20, the rock-shaft 17 from whichsaid arm projects, and also the other arm 19 of the rock-shaft, towardthe right. This movement of the arm 19 toward the right exerts a pull onlink 15 in the same direction, and consequently the medially pivotedlever 13 is turned in a direction to restore it to normal position. Theslever 11, of course, is then free to be swung in either direction, inaccordance with whether it is desired that the elevator cage shouldascend or descend.

Figs. 1 to 4 show an arrangement applicable to an elevator cage in whichthe operating lever is located adjacent to the side of said cage whichis at right angles to the side of the elevator shaft or well in whichthe door affording access to the elevator cage is located. In many formsof elevators, however, the operating lever is located on the same sideas the door which affords access to the cage. I have therefore shown inFig. 5 of the drawings a modified form of construction applicable to anelevator such as last referred to. In this modification, instead of thearm 20 of the rock-shaft 17 acting against a rod such as 21, it isadapted to act against a link 27. The inner end of this link ispivotally connected to the depending arm of a pivoted bell-crank lever28. The other horizontal arm of this bell-crank lever is pivotallyconnected to a short link 29, and the upper end of this link in turn ispivotally connected to a rod 30 which is movable in a guide or keeper31. The upper end of rod 30 is rigidly connected to a bar 32, said barbeing movable vertically in guides 33. This bar 32 is provided centrallyon its upper edge with a notch 34, which is adapted to cooperate with apin or stud 35 extending from the operating lever 11. It will beunderstood that the bar 33 is located back of the lever, or in otherwords, between the lever and the wall of the elevator cage. In theoperation of this modified form, when the door is pushed to the righttoward an open position, the rail 10 acts on the roller 14 of lever 13,the same as in the principal form of construction, and through the lever13 causes a pulling of the link 15 toward the left, and consequentinward turning of the rock-shaft 17 toward the elevator cage. Thisturning of the rock-shaft 17 causes the arm 20 thereof to act againstthe link 27 and thereby push said link toward the left of Fig. 5. Thismovement of the link causes a turning of the bell-crank lever in adirection to move the short link 29 and the rod 30 upwardly. As rod 30has rigidly connected thereto the bar 32 said bar is moved upwardly withthe rod, and the notch 34: of the bar is thereby brought into engagementwith the pin 35 of the operating lever, which of course occurs when theelevator cage is brought to a landing and the operating lever thrown toa central position for stopping the cage at such landing. When it isdesired to start the cage, the door is slid toward the left or toward aclosed position. The weight of the rod 30 and the bar 32 to which saidrod is attached, causes these parts to descend and consequently thenotch 34 of the bar 32 is brought out of engagement with the pin 35, andthereby the lever 11 is released so as to render it capable of beingoperated. The descent of rod 30 and bar 32 also causes a return of theother parts to normal position.

What I claim as my invention:

1. In a safety device for elevators, the combination of an elevatorshaft provided with an opening at the landing thereof, a door forcontrolling said opening, an elevator cage adapted to travel in theelevator shaft, cage controlling mechanism within the elevator cage,locking mechanism adapted, when the elevator cage reaches the landingand is stopped and the door is opened, to lock said controllingmechanism, a rockshaft mounted in bearings located in one of the wallsof the elevator shaft, said rockshaft provided with two projecting arms,one of said arms being so positioned that when the rock-shaft is rockedin one direction it will act on the locking mechanism in a manner tocause the controlling mechanism to be engaged and locked thereby, andwhen said shaft is rocked in the opposite direction to permit of thecontrolling mechanism being unlocked, a link jointed to the other arm ofthe rock-shaft, and a medially pivoted lever to one end of which theother end of said link is connected, the opposite end of said mediallypivoted lever being so positioned as to be acted upon by the door whenthe door is opened, to thereby, through the link, efiect the turning ofthe rock-shaft in the direction to cause the locking mechanism, when theelevator cage is at a landing, to engage and lock the conrock-shaft,link and medially pivoted lever to normal positions.

sliding door for controlling said opening, a rail rigid with andextending across said door, an elevator cage adapted to travel in theelevator shaft, cage controlling mechanism within the elevator cage,locking mechanism adapted, when the elevator cage reaches the landingand is stopped and the door is opened, to lock said controllingmechanlsm, a rock-shaft mounted in bear-c ings located in one of thewalls of the elevator shaft, said rock-shaft provided with twoprojecting arms, one of said arms being sopositioned that when therock-shaft is rocked in one direction, it will act on the lockingmechanism in a manner to cause the controlling mechanism ,to be locked,and when said shaft is rocked in the opposite direction to permit of thecontrolling mechanism being unlocked, a link jointed to the other arm ofthe rock-shaft, and a medially pivoted lever to one end of which theother end of said link is connected, the opposite end of said mediallypivoted lever being so positioned as to be acted upon by the rail of thedoor, when the door is opened, to thereby through the link effect theturningpf the rock-shaft in a direction to cause the locking mechanism,when the cage is at the landing, to engage and lock the controllingmechanism, and when the medially pivoted lever is released by theclosing of the door, to permit the unlocking of the controlling mechanism, and a restoring of the rock-shaft, link and medially pivoted leverto normal positions.

3. In a safety device for elevators, the combination of an elevatorshaft provided with an opening at the landing thereof, a sliding doorfor controlling said opening, a rail rigid with and extending acrosssaid door, an elevator cage adapted to travel in the elevator shaft,cage controlling mechanism within the elevator cage, locking mechanismadapted, when the elevator cage reaches the landing and is stopped andthe door is opened, to lock said controlling mechanism, a rock-shaftmounted in bearings located in one of the walls of the elevator shaft,said rock-shaft provided with two projecting arms, one of said armsbeing so positioned that when the rock-shaft is rocked in one directionit will act on the locking mechanism in a manner to cause thecontrolling mechanism to be locked, and when said shaft is rocked in theopposite direction to permit of the controlling mechanism beingunlocked, a link jointed to the other arm of the rocloshaft, a mediallypivoted lever jointed at one end to one end of the link and a rollercarried at the opposite end of the lever, said end of the lever whichcarries the roller being so positioned 2. In a safety device forelevators, the combination of an elevator shaft provided, with anopening at the landing thereof, a

locking mechanism, when the cage is at the 'landlng, to engage and lockthe controlllng mechanism, and when the medially pivoted lever isreleased by the closing of the door,

to permit the unlocking of the controlling mechanism, and a restoring ofthe rockshaft, link and medially pivoted lever to normal positions.

l. In a safety device for elevators, the combination of an elevatorshaft provided with an opening at the landing thereof, a door forcont-rolling said opening, an elevator cage adapted to travel in theelevator shaft, cage, controlling mechanism within the elevator cage, aslidable rod, a locking bar rigidly secured to the slidable rod, arock-shaft mounted in bearings located in the Wall of the elevatorshaft, said rockshaft provided with projecting arms, a link having oneend connected to one of the arms of the rock-shaft, and a mediallypivoted lever having one end connected to the opposite end of the link,and its opposite end so positioned as to be operated upon by the doorarid turned in one direction when the door is opened, to thereby,through the link, effect the turning of the rock-shaft in a direction tocause the other arm of said rockshaft to act upon and move the slidablerod and the locking bar, when the elevator cage is at a landing, in adirection to effect the engagement of the locking bar with thecontrolling mechanism, and when the medially pivoted lever is releasedby the closing of the door, to permit of the sliding of the slidable rodand bar in a direction to effect the disengagement of the locking barfrom the controlling mechanism, and the restoring of the several partsto normal position.

5. In a safety device for elevators, the combination of an elevatorshaft provided with an opening at the landing thereof, a door forcontrolling said opening, an elevator cage adapted to travel in theelevator shaft, a controlling lever extending into the elevator cage, amovable notched bar within the elevator cage, a rod rigid with said barand extending through the side of the elevator cage, a rock-shaftmounted in bearings located in the wall of the elevator shaft, saidrock-shaft provided with pro jecting arms, one of said arms being sopositioned as, when the rock-shaft is turned in a d1rect1on toward thecage, to act on the outwardly extending rod and cause the same and itsattached bar to move in a direction to bring the notch of the bar intolocking engagement with the lever, a link having one end connected tothe other arm of the rock-shaft, and a medially pivoted lever having oneend connected to the opposite end of the link and its opposite end sopositioned as to be operated upon by the door and turned in onedirection, when the door is opened, and when themedially pivoted leveris released by the closing of the door to permit the unlocking of thecontrolling mechanism and a restoring of the rockshaft, link andmedially pivoted lever to normal positions.

6. In a safety device for elevators, the combination of an elevatorshaft provided with an opening at the landing thereof, a door forcontrolling the opening, a rail rigid with and extending across thedoor, an elevator cage adapted to travel in the elevator shaft, acont-rolling lever extending into the elevator cage, a movable notchedbar withing the elevator cage, a rod rigid with said bar and extendingthrough the side of the cage, a spring engaging the rod and acting tonormally hold said rod and its attached bar outwardly, a rock-shaftmounted in bearings located in the wall of the elevator shaft, saidrock-shaft provided'with projecting arms, one of said arms being sopositioned as, when the rock-shaft is turned toward the elevator cage,to act on the outwardly extending rod and cause the same and itsattached bar to move in a direction to bring the notch of the bar intolocking engagement wit-h the lever, a link having one end connected tothe other arm of the rock-shaft, and a medially pivoted lever having oneend connected to the opposite end of the link and its opposite end sopositioned as to be operated upon by the rail of the door and turned inone direction when the door is opened to thereby, through the link,effect the turning of the rockshaft in a direction to cause the lockingmechanism, when the elevator cage is at a landing, to engage and lockthe controlling mechanism, and when the medially pivoted lever isreleased by the closing of the door to permit of the movement of the rodand bar in a direction to effect the disengagement of the locking barfrom the controlling mechanism,-and a restoring of the several parts tonormal positions.

In testimony whereof, I atfiX my signature, in presence of twowitnesses.

ANDREW J. BAUTZ.

Witnesses:

A. L. MoRsELL, ANNA F. sCI-IMIDTBAUER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

